It will work useing the full url...
You have to use the url from the Embed code tho..
Say your Embed code is this,,
Code:
<object width="425" height="355"><param name="movie" value="http://www.youtube.com/v/wfjWwGPtAls&rel=1"></param><param name="wmode" value="transparent"></param><embed src="http://www.youtube.com/v/wfjWwGPtAls&rel=1" type="application/x-shockwave-flash" wmode="transparent" width="425" height="355"></embed></object>
Members would just input this,,
Code:
http://www.youtube.com/v/wfjWwGPtAls&rel=1
I`ll make anther one just for full urls...